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Stephen Fry (no relation) asks Adam and Hannah to investigate the following question:

"All my life I have been mildly plagued by the fact that I have a quite appalling ability to remember faces. I cut people I should know well dead in the street, or at least fail to recognise them in a way which must often be hurtful.

At a party I can talk to someone for ten minutes and then see them again twenty later and have no idea who they are unless I\u2019ve made an effort to fix some accessory or item of their dress in my mind. If I see them the next day in another context I\u2019ll have no idea who they are. It\u2019s distressing for me in as much as I hate the idea that people might think I am blanking them, or think little of them, don\u2019t consider them significant and so forth.

I\u2019d be very grateful if my sister-in-surname and her eximious partner Adam could investigate prosopagnosia for me and offer any hint add to as to its cause or even possible \u2013 I won\u2019t say \u201ccure\u201d as I am sure it\u2019s chronic and untreatable \u2013 but at least any interesting ways of relieving it."

Hannah and Adam call in the experts, neuroscientists Sophie Scott and Brad Duchaine. Why is it that some people struggle with prosopagnosia, whilst others never forget a face?

You can find out more about Face Blindness, who it affects and how to cope with it by visiting www.faceblind.org.uk/

Presenters: Hannah Fry, Adam Rutherford\nProducer: Michelle Martin

First broadcast on BBC Radio 4 in 2019.